35-year-old Eva is unpredictable, charmingly immature and has no children. Leon is 10, he’s got the seriousness and reasoning of an adult and has no parents. Eva is bored in her privileged life as well as in her love life. Leon has just run away from his reception center to try to find his mother. They weren’t meant to meet but yet will spend five unforgettable days together. He will teach her to grow up, and her, to become a child again